Nvidia didn't make a big fuss out of it due to the fact that these "new" mobile GPUs are based on the older 200M series, and are thus just another rebrand.

Nvidia announced a total of seven GPUs stretching across the high performance, performance and mainstream segment. The high performance is taken by the GTS 360M and 350M, the performance has GT 335M, GT 330M and GT325M while the mainstream has 310M and the 305M GPUs. While AMD is quite confident in doing DirectX 11 on notebooks with discreete graphics, Nvidia is still stuck with DirectX 10.